Perplexity - a new predictor of cognitive changes in spoken language?: Results of the interdisciplinary longitudinal study on adult development and aging (ILSE) - Frankenberg, Claudia; Weiner, Jochen; Schultz, Tanja; Knebel, Maren; Degen, Christina; Wahl, Hans-Werner; Schröder, Johannes (Linguistics vanguard, 2019)